Hard 16 Against a Dealer Ace

Updated

Surrender if the table allows it. If not, hit. What you must not do is stand — against an ace that is the most expensive mistake on the entire 16 row, worth 15.0% of your bet.

The short version
Every number on this page is computed for a six-deck game with our own solver, then checked against an independent reference. The calculator will do the same for your exact table and hand.

The ace is the strongest card the dealer can show

Even after the dealer has peeked and does not have blackjack, an ace still finishes at 17 or better about 83% of the time and busts only 16.7%. Nothing else on the table is close.

That is why standing collapses here. Standing on 16 wins only when the dealer breaks, and an ace breaks less often than any other card by a wide margin. You are betting on a one-in-six event when the alternative gives you a genuine shot at improving.

What each option is actually worth

Six decks, dealer stands on soft 17, dealer has peeked and does not have blackjack, averaged across every two-card 16. Bet of 1 unit:

break even Surrender -0.500 Hit -0.515 Stand -0.665
The gap between hitting and standing is wider here than against any other upcard. An ace punishes passivity hardest.

On a no-hole-card table

European and most online live tables deal the dealer a single card and take no hole card until the end. That changes the arithmetic in one specific way: if you surrender and the dealer later turns over a blackjack, many no-hole-card tables take your whole bet rather than half.

Where that rule applies, surrender against an ace loses its edge and hitting becomes the practical answer. Check what your table does with surrender against a possible blackjack before relying on it.

Keep reading

16 against a 10the same call, smaller gap 11 against an acewhere the ace flips a double 16 against a 7where you must not surrender

By Martin Kosek · every number on this site is computed by us, not copied.

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